High disk I/O problem - Apache related?
Current research:
The SWAP IO doesn't coincide with all the IO peaks:
~~http://imgur.com/YGJNufH.png
The memory usage is around 60% while a peak is occurring
It doesn't seem to be an application issue neither, as the IO peaks aren't related to higher network traffic
~~http://imgur.com/CeA0xIy.png
I had the luck to coincide with one of these peaks, and with iotop I could realize all the activity was due to Apache read operations.
~~http://i.imgur.com/JPUkyZl.png
Our configuration is the following:
Ubuntu 12.04 Intel(R) Xeon(R) CPU L5520 @ 2.27GHz
1GB RAM
256MB SWAP
Main technology: LAMP, Zend, Redis and Node
Apache version: 2.4.6
Overall, there are a couple of questions:
Why apache would read that amount of information?
Could this situation be normal, and we can just update Linode disk IO alert threshold?
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1 Reply
There may be an issue with your site(s) if they are causing sever IO spikes. What kind of sites are you running? The more you tell us about your Linode/websites the easier it will be for us to help you.